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Rear-wheel drive (RWD) typically places the engine in the front of the vehicle and the driven wheels are located at the rear, a configuration known as front-engine, rear-wheel drive layout (FR layout). The front mid-engine, rear mid-engine and rear engine layouts are also used.
Diffen âº Science âº Physics âº Mechanics. All wheel drive or AWD means that the vehicle is designed to provide power to all four wheels at the same time, and in most cases cannot be switched to the two wheel drive (2WD) option.The distribution of power to the front-and hind-set of wheels differs from one system to another.4WD or four wheel drive (part time and full time) also means the vehicle has a drivetrain that allows all four wheels to receive torque from the engine simultaneously.he distribution of power to the front-and hind-set of wheels differs from one system to another. 4WD or four wheel drive (part time and full time) also means the vehicle has a drivetrain that allows all four wheels to receive torque from the engine simultaneously.